diabetic retinopathy is one of the most important reasons of blindness which causes serious damage in the retina. the aim of this research is to detect one lesions of the retina, named exudates automatically with image processing techniques. preprocessing is the first step of proposed algorithm. after preprocessing, the optic disc was detected and removed from the retinal image due to the same ...

to investigate the effect of preprocessing techniques including contrast enhancement and illumination correction on retinal imagequality, a comparative study was carried out. we studied and implemented a few illumination correction and contrast enhancementtechniques on color retinal images to find out the best technique for optimum image enhancement. to compare and choose thebest illumination c...

Artistic robotic painting implies creating a picture on canvas according to brushstroke map preliminarily computed from source image. To make the look closer human artwork, image should be preprocessed render effects usually created by artists. In this paper, we consider three preprocessing effects: aerial perspective, gamut compression and coherence. We propose an algorithm for perspective amp...

Standard image processing techniques are not applicable to radar images because of the coherent nature of the sensor. Therefore there is a need to develop preprocessing techniques for radar images which will then allow these standard methods to be applied. A random field model for radar image data is developed. This model de~­ cribes the image data as the result of a mult1plicative-convolved pr...